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OpenStudy (anonymous):
Find the center and radius of the circle whose equation is x^2 -8 x + y^2 + 6 y -9 = 0
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OpenStudy (anonymous):
The equation for a circle is (x-h)^2+(y-k)^2=r^2, where the center is (h,k)
OpenStudy (anonymous):
Simplify it to (x-h)^2+(y-k)^2=r^2
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